diff --git a/packages/shared/CheckStringCoercion.js b/packages/shared/CheckStringCoercion.js
index 1a061b660177b..a186d6755d99e 100644
--- a/packages/shared/CheckStringCoercion.js
+++ b/packages/shared/CheckStringCoercion.js
@@ -43,6 +43,7 @@ function willCoercionThrow(value: mixed): boolean {
   }
 }
 
+/** @noinline */
 function testStringCoercion(value: mixed) {
   // If you ended up here by following an exception call stack, here's what's
   // happened: you supplied an object or symbol value to React (as a prop, key,
diff --git a/scripts/rollup/build.js b/scripts/rollup/build.js
index 2ade58493a5f2..df9fb00b09424 100644
--- a/scripts/rollup/build.js
+++ b/scripts/rollup/build.js
@@ -361,7 +361,8 @@ function getPlugins(
     const isProduction = isProductionBundleType(bundleType);
     const isProfiling = isProfilingBundleType(bundleType);
 
-    const needsMinifiedByClosure = isProduction && bundleType !== ESM_PROD;
+    const needsMinifiedByClosure =
+      bundleType !== ESM_PROD && bundleType !== ESM_DEV;
 
     return [
       // Keep dynamic imports as externals